diff --git a/multi_user/bl_types/bl_camera.py b/multi_user/bl_types/bl_camera.py
index b36baeb..d90b56d 100644
--- a/multi_user/bl_types/bl_camera.py
+++ b/multi_user/bl_types/bl_camera.py
@@ -51,10 +51,6 @@ class BlCamera(BlDatablock):
         assert(self.buffer)
         self.pointer = bpy.data.cameras.get(self.buffer['name'])
 
-    def diff(self):
-        return (self.bl_diff() or
-                len(diff(self.dump(pointer=self.pointer), self.buffer)))
-
     def is_valid(self):
         return bpy.data.cameras.get(self.buffer['name'])
 
diff --git a/multi_user/bl_types/bl_collection.py b/multi_user/bl_types/bl_collection.py
index c946c2a..91659ec 100644
--- a/multi_user/bl_types/bl_collection.py
+++ b/multi_user/bl_types/bl_collection.py
@@ -43,11 +43,6 @@ class BlCollection(BlDatablock):
     def resolve(self):
         assert(self.buffer)      
         self.pointer = bpy.data.collections.get(self.buffer['name'])
-   
-    def diff(self):
-        return (self.bl_diff() or
-                len(self.pointer.objects) != len(self.buffer['objects']) or 
-                len(self.pointer.children) != len(self.buffer['children']))
 
     def resolve_dependencies(self):
         deps = []
diff --git a/multi_user/bl_types/bl_curve.py b/multi_user/bl_types/bl_curve.py
index c64f48c..37695bf 100644
--- a/multi_user/bl_types/bl_curve.py
+++ b/multi_user/bl_types/bl_curve.py
@@ -50,10 +50,6 @@ class BlCurve(BlDatablock):
         assert(self.buffer)      
         self.pointer = bpy.data.curves.get(self.buffer['name'])
 
-    def diff(self):
-        return (self.bl_diff() or
-                len(diff(self.dump(pointer=self.pointer), self.buffer)) > 1)
-
     def is_valid(self):
         return bpy.data.curves.get(self.buffer['name'])
 bl_id = "curves"
diff --git a/multi_user/bl_types/bl_gpencil.py b/multi_user/bl_types/bl_gpencil.py
index 61fb82c..0b74207 100644
--- a/multi_user/bl_types/bl_gpencil.py
+++ b/multi_user/bl_types/bl_gpencil.py
@@ -58,9 +58,6 @@ class BlGpencil(BlDatablock):
             for mat in data['materials']:
                 target.materials.append(bpy.data.materials[mat])
 
-    def diff(self):
-        return (self.bl_diff())
-
     def dump(self, pointer=None):
         assert(pointer)
         data = utils.dump_datablock(pointer, 2)
diff --git a/multi_user/bl_types/bl_material.py b/multi_user/bl_types/bl_material.py
index b3098cd..58a03b9 100644
--- a/multi_user/bl_types/bl_material.py
+++ b/multi_user/bl_types/bl_material.py
@@ -131,11 +131,6 @@ class BlMaterial(BlDatablock):
         assert(self.buffer)
         self.pointer = bpy.data.materials.get(self.buffer['name'])
 
-    def diff(self):
-        diff_rev = diff(self.dump(pointer=self.pointer), self.buffer)
-        return (self.bl_diff() or
-                len(diff_rev.keys()) > 0)
-
     def resolve_dependencies(self):
         # TODO: resolve node group deps
         deps = []
diff --git a/multi_user/bl_types/bl_mesh.py b/multi_user/bl_types/bl_mesh.py
index 765a0a1..1a7cda5 100644
--- a/multi_user/bl_types/bl_mesh.py
+++ b/multi_user/bl_types/bl_mesh.py
@@ -156,11 +156,6 @@ class BlMesh(BlDatablock):
         assert(self.buffer)      
         self.pointer = bpy.data.meshes.get(self.buffer['name'])
 
-    def diff(self):
-        return (self.bl_diff() or
-                len(self.pointer.vertices) != len(self.buffer['verts']) or 
-                len(self.pointer.materials) != len(self.buffer['materials']))
-
     def resolve_dependencies(self):
         deps = []
         
diff --git a/multi_user/bl_types/bl_object.py b/multi_user/bl_types/bl_object.py
index 7e91c47..fb08bb9 100644
--- a/multi_user/bl_types/bl_object.py
+++ b/multi_user/bl_types/bl_object.py
@@ -103,11 +103,6 @@ class BlObject(BlDatablock):
         except:
             pass
 
-    def diff(self):
-        diff_rev = diff(self.dump(pointer=self.pointer), self.buffer)
-        return (self.bl_diff() or
-                len(diff_rev.keys())>0)
-
     def resolve_dependencies(self):
         deps = []
 
diff --git a/multi_user/bl_types/bl_scene.py b/multi_user/bl_types/bl_scene.py
index 19ffa81..83d50f1 100644
--- a/multi_user/bl_types/bl_scene.py
+++ b/multi_user/bl_types/bl_scene.py
@@ -58,11 +58,6 @@ class BlScene(BlDatablock):
         scene_name = self.buffer['name']
         
         self.pointer = bpy.data.scenes.get(scene_name)
-    
-    def diff(self):
-        return (self.bl_diff() or
-                len(self.pointer.collection.objects) != len(self.buffer['collection']['objects']) or 
-                len(self.pointer.collection.children) != len(self.buffer['collection']['children']))
 
     def resolve_dependencies(self):
         deps = []
diff --git a/multi_user/libs/replication b/multi_user/libs/replication
index bd411f7..ef77f6c 160000
--- a/multi_user/libs/replication
+++ b/multi_user/libs/replication
@@ -1 +1 @@
-Subproject commit bd411f7dbb4079efb346b791df5ed7fd465349e7
+Subproject commit ef77f6c664bcfb0cb6fddc8e9c89020b88795176